test: fix cli mocks, add pytest config and coverage gaps

- tests/test_cli.py: fix 26 fetch_issues_with_spent_time mocks to return
  3-element tuples (issue, hours, activities) matching the real signature
- pyproject.toml: add [tool.pytest.ini_options] with testpaths and
  pythonpath so bare pytest works
- tests/test_client.py: add pagination test (>100 time entries arriving
  in pages, hours aggregated across all pages)
- tests/test_formatters.py: add structural tests — XLSX full header row
  and grand total row via openpyxl, HTML thead with all columns and
  tbody row count
- add strict xfail trap-tests for known bugs: #58 (naive created_on vs
  aware dedup cutoff TypeError) and #59 (parse_date_range rejects
  datetime range from dynamic+datetime period)

Closes #67

tests/test_formatters.py

@@ -396,6 +396,32 @@ def test_xlsx_has_totals(fake_rows, tmp_path):
     assert ws["F2"].number_format == "0.00"
 
 
+def test_xlsx_has_full_header_row_and_grand_total_row(fake_rows, tmp_path):
+    """XLSX содержит полный ряд заголовков колонок и финальную строку общего итога."""
+    from openpyxl import load_workbook
+
+    output = tmp_path / "report.xlsx"
+    XLSXFormatter().save(fake_rows, str(output))
+
+    wb = load_workbook(str(output))
+    ws = wb.active
+
+    headers = [ws.cell(row=1, column=c).value for c in range(1, 8)]
+    assert headers == [
+        "Project",
+        "Version",
+        "Issue ID",
+        "Subject",
+        "Status",
+        "Hours",
+        "Spent Time",
+    ]
+
+    # Последняя строка — общий итог по всем проектам
+    assert ws.cell(row=ws.max_row, column=1).value == "Total"
+    assert ws.cell(row=ws.max_row, column=6).value == 22.5
+
+
 def test_xlsx_no_time_keeps_columns_empty_and_skips_totals(fake_rows, tmp_path):
     """XLSX с no_time: колонки времени пустые, итогов нет."""
     from openpyxl import load_workbook
@@ -456,6 +482,25 @@ def test_html_output_has_doctype_and_charset(fake_rows):
     assert '<meta charset="utf-8">' in output
 
 
+def test_html_has_table_structure_with_all_columns(fake_rows):
+    """HTML-отчёт содержит thead со всеми колонками и по строке на каждую задачу."""
+    output = HTMLFormatter().format(fake_rows)
+
+    assert "<thead>" in output
+    assert "<tbody>" in output
+    for header in (
+        "Наименование Проекта",
+        "Номер версии*",
+        "Задача",
+        "Статус Готовность*",
+        "Затрачено за отчетный период",
+    ):
+        assert f"<th>{header}</th>" in output
+
+    tbody = output.split("<tbody>", 1)[1]
+    assert tbody.count("<tr>") == len(fake_rows)
+
+
 # -- Тесты ODT форматтера --